Licensed Radon Testing Experts

With over 13 years of experience in home building, testing, and inspection, Safe Investment Home Inspections is a trusted authority in radon testing. Our NRPP-certified technicians use modern continuous radon monitors to deliver fast, reliable reports—perfect for homeowners, real estate transactions, and safety peace of mind.

• NRPP-certified and highly trained professionals
• Use of continuous radon monitors for hourly readings
• Detailed radon reports with guidance and mitigation options
• Local expertise throughout Denver Metro & Front Range

What is Radon & Why Does It Matter?

Radon is a radioactive, odorless, colorless gas resulting from the decay of uranium in soil and rock. It can enter homes through foundation cracks, crawlspaces, sump pits, and other openings. Because you can’t see or smell it, testing is the only way to know if your indoor air is safe.

• Second leading cause of lung cancer in the U.S.
• Can accumulate even in newer homes and well-constructed foundations
• Exposure over time increases health risks significantly
• EPA recommends testing every home, particularly in high radon potential areas like Denver Front Range

48-Hour Real-Estate Radon Testing

For property transactions, closings, or when you need results quickly, our 48-hour real-estate radon testing option is ideal. We perform a short‐term test using a continuous radon monitor over a full 48 hours under closed-house conditions. This gives a reliable snapshot of radon levels across day and night cycles and meets Colorado and EPA guidelines for real estate transactions.

• Closed-house conditions required for accuracy (windows and exterior doors closed, except for normal entry/exit)
• Continuous monitors record hourly radon fluctuations for precise results
• Testing done on the lowest livable level of the home
• Devices placed away from vents, doors, windows, or direct sunlight
• Fast turnaround reports suitable for real-estate contracts and negotiations

Standard & Long-Term Testing Options

If you want a more comprehensive picture of the radon exposure over seasons, we also offer long-term testing (90+ days). Long-term testing smooths out daily variations and gives a more stable estimate of the year-round average.

Frequently Asked Questions About Radon Testing

How long does a radon test take?

Our standard real-estate radon test lasts a minimum of 48 hours. This allows our continuous radon monitor to measure hourly fluctuations and provide a reliable average reading. For homeowners not in a rush, long-term tests (90+ days) give an even more complete picture of radon exposure.

Where is the radon test placed in the home?

Tests are performed on the lowest livable level of your home, such as a basement or first floor. Monitors are positioned away from windows, vents, or direct sunlight to avoid interference, usually between two and seven feet above the floor.

Do I need to prepare my home before a radon test?

Yes. For a short-term radon test, “closed house conditions” must be maintained for at least 12 hours before the test begins and during the entire test period. This means keeping windows and exterior doors closed, except for normal entry and exit. Heating and cooling systems can run normally.

How much radon is considered unsafe?

The U.S. EPA action level is 4.0 picocuries per liter (pCi/L). If your test shows radon levels at or above this threshold, we recommend consulting with a mitigation professional to lower exposure. Even lower levels can pose risks over long periods, so testing is always important.

Is radon testing required when buying or selling a home?

While Colorado law does not require radon testing for every transaction, many real estate contracts include it as part of the inspection process. Buyers often request a radon test, and sellers can benefit from testing in advance to avoid last-minute surprises during negotiations.